Fluctuating boost

[TYTILIDIE]

I noticed recently that when I am WOT from 3rd gear on my boost gauge will fluctuate between 15 and 7 psi. Anyone have a clue what could cause this? My motor is new so I cant imagine why this would happen. Tach doesnt flutter and RPMS climb steady but much slower than they should. Any help would be appreciated. Thanks.


Mike

 

[odium]

I have boost fluctuation at WOT as well. I also have a massive exhaust leak between the headers and turbo, and I know it's my prob. Check for an exhaust leak.

Also, if it's the stock boost gauge and everything else feels fine (you can't feel it fluctuate), I would say it's due to a crappy stock gauge. Get an aftermarket boost gauge, if you don't already have one.

 

[TYTILIDIE]

I dont feel anything in the motor but it does feel really sluggish. The gauge is stock and I have plans to get a new one. Why would an exhaust leak cause that after 1st and 2nd but not during. 1st and 2nd feel great.

Mike

 

[odium]

Oh, I didn't know it was great at those shifts. Mine fluctuates extremely oddly, so I can't really tell where and when it's going to fluctuate.

If you have datamaster, turbolink, etc., post a few runs while datalogging. Somebody here will be able to help you a lot better.

 

[TYTILIDIE]

Yeah im working on datamaster. Just got the laptop. Need to find out how to make the cable. Need the program also.

 

[Divergent Lightning]

Get a real boost gauge. The stock one might as well be a fancy looking toy that came with the car.

 

[turbodog]

I had boost fluctuation which was solved by replacing the boost solenoid. $18 well spent.

 

[SeattleSy#1255]

new motor, but are you running a new turbo setup? If not, the stocker is a POS. You may already know that, but if you don't, i'd bet anything that is your problem.

stock boost gauge is a POS as well...get a aftermarket gauge like the other mentioned or read it on a scan tool.

 

[TYTILIDIE]

I would say I would ditch the turbo but it worked fine before and didnt fluctuate. Ok ok I cant afford it even if it was broken. :roll: Not too sure the turbo is the answer though. Im thinkin maybe fuel related? I have one of those POS autozone pumps. Gettin Walbro soon as possible. AFPR also.

 

[SeattleSy#1255]

i didn't mean turbo as much as I met stock WG...sorry for not making that clear. could be FP...if you have the stock ECM, i think it'll pulling timeing and drop boost if you are not getting the proper fueling???